/proc/self/root/proc/thread-self/root/proc
This explorer reads the filesystem of the server it runs on, so /workspace/user isn't present here. Browsing and the terminal still work against this server's own disk from /.
#subsys_name hierarchy num_cgroups enabledcpuset 6 1 1cpu 8 36 1cpuacct 8 36 1blkio 2 33 1memory 7 47 1devices 11 33 1freezer 10 4 1net_cls 4 1 1perf_event 5 1 1net_prio 4 1 1hugetlb 3 1 1pids 9 33 1